Air control for oil burners



2 Sheets-Sheet 2 m l hm l|\\\\\\\ Illllllllllllllll April 26, 1927-.

lllll Patented Apr. 26, 1927.

UNITED STATES PATENT OFFICE.

FRANK S. EGLOFI', OF RIVERSIDE, ILLINOIS, ASSIGNOR BY MESNE ASSIGNMENTS, TO THE PHOENIX BURNER CORPORATION, A. CORPORATION OF ILLINOIS.

Ara conraor. roa oIL- hummus.

This invention relates generally to a device for controlling the flow of air, and more particularly to an apparatus of this character which may be associated advantageous- 1y with an oil heating plant for the purpose of assuring thereto a desirable'supply of an irrespective of draft conditions in the stack.

In the particular exemplification illustrated, the apparatus is associated with a burner which, if desired, may be of the general kind which is shown and described in my pending application for patent on oil burners, filed October 19, 1925, as Serial No. 63,254. It should-be understood, however, that it may with equal advantage be installed with other types of burners. It is designed for production at small expense,

to be simple as possible, to operate with a minimum of moving parts, and to compensate for varying draft conditions which are ordinarily encountered.

Referring to the drawings:

Figure 1 shows in elevation a beating plant in which is installed a burner having associated therewith an air control apparatus which embodies my invention;

Fig. 2 is an enlarged longitudinal section through the control apparatus, taken in a vertical plane;

Fig. 3 is an enlarged detail in elevation of a fuel regulating valve having an operative connection with the present air control;

Fig. 4 is an enlarged detail in horizontal section taken on line 44 of Fig. 2;

Fig. 5 is an elevation looking toward the intake end of the air control; and.

Fig. 6 is a transverse section therethrough taken on line 6-6 of Fig. 2.

I have shown in the drawing a heating plant A from which leads a flue B having connection with a stack or chimney, not shown. Installed in the heating plant is an oil burner C which may be of any con-' ventional type, the mounting therefor being a walled structure D forming part of the resent air control. Such a burner may ave a chamber 10 wherein is received its primary air supply, also a secondary air chamber 11, the combustion being supported by the air which is delivered thereto. For convenience in manufacture and assembly, I provide at the forward end'of the walled structure an extension E which, to all intents and purposes, is an integral part thereof. An adjustable support for the structure 65 .may be provided in three legs 12 by which the burner is held in a level position. within the walled structure is a main longitudinal passage 13 which, as shown, extends :also for its full width. At the outer ormtake end I may provide an inner boxllke lining 14 of a height less than the main passage 13 to accommodate in the intervening space a longitudinally extending channel member 15 which defines a narrow secondary passage 16 of smaller area. The intake end of this secondary passage may, if desired, overhang the corresponding end of the main passage 13. A wall or plate 17 over the intake end of the extension E provides upon either side of the secondary passage a fixed closure which extends slightly therebelowand also along the side walls of the box limng 14. There is thus formed in this front wall a relatively large intake opening wherein are provided a pair of mountings shown as horizontally disposed slots 18 at the sides thereof adjacent its top. Rested upon these two mountings are the ends of a damper 19 which is adapted to so close the intake opening when in vertical position. Along the upper end of the damper is a flange 20 from which extends rearwardly an arm 21 whereon is adjustably carried a weight tending to balance the damper in a position somewhat as shown in Fig. 2. By such a construction the damper is pivotally supported in a position to swing freely and thereby vary the clearance through the intake of the main passage 13. If desired an adjustable stop 29 may be provided to prevent the damper from closing the passage completely.

At the rear end of the lining 14 is a pending wall 22 which supports a swinging damper 23 adapted to regulate the air flow through the passage 13. In a lowermost position, which is preferably angular (see Fig. 2). the air flow would be completely shut off. The movements of this damper may be controlled by an arm 24 connected therewith which is extended radially from a rod 25 having a rotativc mounting in the two walls 17 and 22: at the forward end of this rod is a slotted arm 26 with which en- 1 gages a pin 27 carried on a control wheel 28 forming part of a fuel regulating valve F. By this arrangement I provide means for adjusting the position of the back dam er 23 whenever the valve F is manipulated: a greater inflow of air being assured as the feed of fuel is increased and vice versa. In the upper part of this walled structure D, onopposite sides of the pasof air. Supplementing this action is that of the rear damper 23 which is operatively connected with the oil regulating valve. Both dampers are interposed in the same passage, i. e., the assage which communicates with the primary air supply of the burner. In addition, a constant flow of air to the secondary air chamber of the burner is assured through the passage 16. This is desirable in order that the minimum amount of oxygen necessary to support combustion, may be furnished at all times.

The parts entering into my, invention may consist largely of sheet metal. When once installed they are subject to no wear or tear, and hence ma be counted upon to operate indefinitely without attention of any kind.

I claim:

1. In combination with a burner having a stack connection, an air control in which is. comprised a passage in communication with the burner, means extending transmounting, a damper for closing the passage having a portion'of itself bent back to overlie the mounting whereby to pivotally support the damper thereupon, and a weight which counterbalances the damper in a manner to normally hold the same open but to permit the damper to move toward a closed position in response to an increased draft in the stack, substantially as described.

'2. In combination with an oil burner having a stack connection, an air control com prising a passage in communication with the burner, a balanced damper which regulates the flow of air through the passage in accordance with the draft exerted by the stack, a second damper also interposed in said passage, a valve for regulating the flow of fuel to the burner, and a connection between said valve and the second damper such that both are opened or closed concurrently, substantially as'described.

3. In, combination with ing a stack connection, an air control comprising separated passages in communication with the burner, one for a primary and the other for a secondary supply of air thereto, a valve for regulating the flow of fuel to the burner, a. damper in the primary passage connected for operation with aid valve in a manner whereby both are opened or closed together, and a balanced damper also in the passage automatically movable in accordance with conditions in the stack, substantially as described.

4:. In combination with an oil burner having a stack connection, an air control in which is comprised a walled structure whereon theburner is rested, there being separated passages within the structure one communicating with the primary and the other with the secondary air supply of the burner, the secondary passage being adjacent the top of the structure and in the center region thereof, and the primary passage being therebelow and extending the width of the structure, pipe connections upon an oil burner haveither side of the secondary passage onie 1 substantially as described. versely of the passage forming a narrow I 5. In combination with an oil burner, an air control in which is comprised a walled structure whereon the burner is mounted, a box-like lining fitted to one end of the walled structure, and a pair of dampers mounted within the lining and operating to regulate the flow of air through the walled structure, substantially as described.

6. In combination with an oil burner having a stack connection, an air control whereon the burner is mounted, said control including a walled structure in which is alongitudinalpassage, 2. box-like lining fitted within said passage near its intake end. and a balanced damper carried by said lining adapted to regulate the air opening through the passage in accordance with draft conditions in the stack, substantially as described.

' S. EGLOFF. 

